/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Copyright (C) 2021-2026 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.

    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.

\*---------------------------------------------------------------------------*/

#include "squarePulse.H"

// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

inline Foam::scalar Foam::Function1s::squarePulse::value(const scalar x) const
{
    return start_ < x && x < start_ + duration_;
}


inline Foam::scalar Foam::Function1s::squarePulse::derivative
(
    const scalar x
) const
{
    return scalar(0);
}


inline Foam::scalar Foam::Function1s::squarePulse::integral
(
    const scalar x1,
    const scalar x2
) const
{
    const scalar sign = x1 < x2 ? +1 : -1;

    const scalar xL = min(x1, x2);
    const scalar xR = max(x1, x2);

    const scalar xLStar = min(max(xL, start_), xR);
    const scalar xRStar = max(min(xR, start_ + duration_), xL);

    return sign*(xRStar - xLStar);
}


// ************************************************************************* //